Suppression of reproduction with 3-oxime and 3-oxime esters of 19-nortestosterone

ABSTRACT

3-OXIMES AND 3-OXIME ESTERS OF 19-NORTESTOSTERONES HAVE POST-COITAL ACTIVITY FOR THE SUPPRESSIONS OF REPRODUCTION.

United States Patent Oflice 3,629,415 Patented Dec. 21, 1971 3,629.415 SUPPRESSION OF REPRODUCTION WITH 3-OXIME AND 3-0XIME ESTERS OF 19-NORTESTOSTERONE Arvin P. Shrolf, Piscataway, N.J., assignor to Ortho Pharmaceutical Corporation No Drawing. Application Apr. 20, 1967, Ser. No. 635,308,

now Patent No. 3,532,689, which is a continuation-inpart of applications Ser. No. 502,384, Oct. 22, 1965, and Ser. No. 563,081, July 6, 1966, now Patent No. 3,437,674. Divided and this application July 18, 1969, Ser. No. 843,201

Int. Cl. A61r 27/00 US. Cl. 424-238 12 Claims ABSTRACT OF THE DISCLOSURE 3-oximes and 3-oxime esters of l9-nortestosterones have post-coital activity for the suppression of reproduction.

This is a division of my application Ser. No. 635,308 filed Apr. 20, 1967, now Pat. No. 3,532,689, which was in turn a continuation-in-part of my applications Ser. No. 502,384 filed Oct. 22, 1965, now abandoned and Ser. No. 563,081 filed July 6, 1966, now Pat. No. 3,437,674.

The novel compounds of the present invention are represented by the formula:

wherein R is hydrogen, an acyl group having from 2 to 8 carbon atoms or a tetrahydropyranyl group, R is hydrogen or an acyl group having from 2 to 10 carbon atoms and R" is methyl or ethyl.

The compounds of the invention possess valuable pharmacologic activity as antilittering agents, and more particularly, as agents for the suppression of reproduction when given postcoitally.

The compounds of the invention are prepared by reacting a compound of the formula:

wherein R and R" have the meaning given above, with a hydroxylamine salt in the presence of a base such as pyridine, sodium hydroxide or sodium acetate to form the corresponding 3-oxime. The 3-oxime may then be esterified by conventional means to prepare the 3-oxime ester.

Typical starting materials for the reaction are 17aethynyl-l9-nortestosterone, which is disclosed in US. Pat. No. 2,774,777, and its esters. These compounds are known as ovulation suppressing agents which are used precoitally.

The following examples illustrate the invention:

EXAMPLE I 17m-ethynyl-IVfi-acetoxy-l9-norandrost-4-en- 3-one oxime A solution of 2.0 g. of 17a-ethynyl-17fl-acetoxy-19- norandrost-4-en-3-one, 10 ml. of pyridine and 1.0 g. of hydroxylamine hydrochloride is heated on a steam bath for one-half hour. The mixture is poured into a large amount of ice and water and the solid thus separated is collected by filtration. It is recrystallized from methanolwater to give 1.6 g. (78%) of l7a-ethynyl-l7fl-acetoxy- 19-norandrost-4-en-3-one oxime, M.P. 229230.

Amax. 238 mp.

Calcd. for C H NO (percent): C, 74.33; H, 8.22; N, 3.94. Found (percent): C, 74.39; H, 8.21; N, 4.01.

EXAMPLE II 17a-ethynyl-19-norandrost-4-en-17B-0l-3-one oxime 17fl-caproyloxy-17ot-ethynyl-19-uorandrost-4-en- 3-one oxime Following the procedure of Example I, but starting with 17,8-caproyloxy-l7a-ethynyl-19-norandrost-4-eu 3 one, there is obtained 17p-caproyloxy-17a-ethyny1-19-uorandrost-4-en-3-one oxime, M.P. -76.

Calcd. for C H NO (percent): C, 75.87; H, 9.06; N, 3.40. Found (percent): C, 75.66; H, 9.21; N, 3.14.

EXAMPLE IV l7fl-propionyloxy-17a-ethynyl-19-norandrost4-en- 3-one oxime Following the procedure of Example I, but starting with l7fi-propionyloxy-17a-ethynyl-19-norandrost-4-en-3- one there is obtained 17fl-propionyloxy-l7a-ethynyl-19- norandrost-4-en-3-one oxime, M.P. -101.

Calcd. for C H NO (percent): C, 74.76; H, 8.46; N, 3.79. Found (percent): C, 74.78; H, 8.65; N, 3.17.

EXAMPLE V 17 3-decanoyloxy-17a-ethynyl-l9-norandrost- 4-en-3-one oxime Following the procedure of Example I, but starting with 17,8 decanoyloxy-17a-ethynyl-l9-norandrost-4-en-3- one, there is obtained 17fi-decanoyloxy-17a-ethyny1-19- norandrost-4-en-3-one oxime, M.P. l28129.5.

Calcd. for C H NO (percent): C, 77.04; H, 9.70; N, 3.00. Found (percent): C, 77.12; H, 9.87; N, 3.27.

In like manner there are prepared:

17u-ethynyl-1318-ethyl-gon-4-en-l7B-ol-3-one oxime,

17a-ethynyl-17 3-caproy10xy-13,8-ethylgon-4-en-3-one oxime, and

l7a-ethynyl- 17fl-decanoyloxy- I 3B-ethyl-gon- 4-en-3-one oxime.

3 EXAMPLE W N, 17,8-diacetoxy-17a-ethynyl-19-norandrost- 4-en-3-one oxime A solution containing 3.0 g. of l7a-ethynyl-l7fi-acetoxy- 19-norandrost-4-en-3-one oxime in 5.0 ml. of pyridine is treated with 9.0 ml. of acetic anhydride and stirred at room temperature for minutes. The mixture is poured into a large amount of ice and water and neutralized with ammonium hydroxide. The solid portion is collected by filtration, dried and recrystallized from hexane to give N,17B-diacetoxy-17a-ethynyl 19 norandrost-4-en-3-one oxime, M.P. 142-144" C.

EtOH Mm.

Calcd. for C H NO (percent): C, 72.51; H, 7.86; N, 3.52. Found (percent): C, 72.54; H, 8.01; N, 3.73.

EXAMPLE VII N-iso-butyryloxy-17p3-acetoxy-17a-ethynyl- 19-norandrost-4-en-3-one oxime Calcd. for C H NO (percent): C, 73.38; H, 8.29; N, 3.29. Found (percent): C, 73.31; H, 8.31; N, 3.53.

EXAMPLE VIII N-propionyloxy-l7fi-acetoxy-17a-ethynyll9-norandrost-4-en-3-one oxime Following the procedure of Example VI or VII, but using propionic anhydride as the esterifying agent, N- propionyloxy-17B-acetoxy-17a-ethynyl 19 norandrost- 4-en-3-one oxime is recrystallized from hexane, M.P.

Calcd. for C H NO (percent): C, 72.96; H, 8.08; N, 3.40. Found (percent): C, 72.69; H, 8.24; N, 3.49.

EXAMPLE IX N-caproyloxy-l7B-acetoxy-17a-ethynyll9norandrost-4-en-3-one oxime Following the procedure of Example I or II, but using caproic anhydride as the esterifying agent, N-caproyloxy- 17B acetoxy-l7a-ethynyl-l9-norandrost-4-en-3-one oxime is recrystallized from hexane, M.P. 102104.

Calcd. for C H NO (percent): C, 74.14; H, 8.67; N, 3.09. Found (percent): C, 74.03; H. 8.55; N, 3.33.

EXAMPLE X N-acetoxy-l7y3-caproyloxy-17a-ethynyl- 10-norandrost-4-en-3-one oxime 4 EXAMPLE x1 N(2'-tetrahydropyranyloxy)-l7)3-acetoxy-17wethynyl- 19-norandrost-4-en-3-one oxime 17ti-acetoxy 17a ethynyl 19 norandrost-4-en-3-one oxime (0.5 g.) is treated with 20.0 ml. of dry benzene, 0.2 g. of p-toluenesulfonic acid and 10 ml. of dihydropyran and is stirred at room temperature for 0.5 hour. The mixture is treated with a large amount of ice and water followed by extraction with ethyl acetate. The organic layer is dried over sodium sulfate and evaporated. Repeated crystallization from methylene chloride-hexane gives N (Z'tetrahydropyranyloxy)-l7B-acetoxy-l7a-ethynyl-l9-norandrost-4-en-3-one oxime, M.P. l72-174.

Calcd. for C21H31NO4 (percent); C, 73.77; H, 8.48; N, 3.19. Found (percent): C, 74.08; H, 8.32; N, 3.45.

EXAMPLE XII A solution containing 4.5 g. of DL-136-ethyl-17a-ethynyl-17fl-acetoxy-gon-4-en-3-one in 15 ml. of pyridine and 2.0 g. of hydroxylamine hydrochloride is heated on a steam bath for 45 minutes. It is cooled and poured into a large amount of ice and water. The solid material thus formed is collected by filtration and air dried. It is recrystallized from methylene chloridealcohol mixture to give 4.2 g. of DL-l3fl-ethyl-17u-ethynyl-l7fi-acetoxy-gon-4-en- 3-one oxime, M.P. 226228.

Calcd. for C H NO (percent): C, 74.76; H, 8.46; N, 3.79. Found (percent): C, 74.84; H, 8.75; N, 3.90.

In like manner there are prepared:

N,l7B-diacetoxy-17a-ethynyl-IBti-ethyl-gon- 4en-3-one oxime,

N-iso-butyryloxy-17B-acet0xy-17Dt-ethynyll 3,8-

ethyl-gon-4-en-3-one oxime,

N-propionyloxy-17fi-acetoxy-17a-ethynyl-13B-ethylgon-4-en-3-one oxime,

N-caproyloxy-17,9-acetoxyl 7a-ethynyl-13,8-ethyl-gon- 4-en-3-onc oxime,

N-acetoxy-17B-caproyloxy-l7a-ethynyl-l3B- ethyl-gon-4-en-3-one oxime, and

N-(2'-tetrahydropyranyloxy -17t1-acetoxy-l7a-ethynyl- 13B-ethyl-gon-4-en-3-one oxime.

The antilittering efiect of a compound is determined by the following procedure:

(1) The compound to be tested is administered in the diet or by gavage for 7 days to both male and female rats, with the sexes segregated.

(2) Treatment is continued for 15 days during which the rats are permitted to cohabit freely.

(3) The sexes are again segregated and are observed for 21 days with no treatment.

A control group is similarly treated except that the compound is not administered.

The females are observed for pregnancies and the size of litters.

The minimum effective dose (MED) is the amount of the compound in milligrams per kilogram of animal body weight per day (mg./kg./day), which completely suppresses the production of litters.

l 7a-ethynyl-17fi-acetoxy-19-norandrost-4en-3one oxime 0.25 17a-ethynyl-19-norandrost-4-en-17fi ol-3-one oxime 0.25

N. 17/1 diaceluxyl 7a-ethynyl- I9-norandrost-4en-3- one oxime E 0.25

TABLE. I-Continnr d MED Compound administered: mg./kg./day N-propionyloxy-l7B-acetoxy-l7a-ethynyl-19- norandrost-4-en-3-one oxime 1.00 N-isobutyryloxy-l7B-acetoxy-17a-ethynyl-19- norandrost-4-en-3-one oxime 1.00 N-caproyloxy-17,3-acetoxy-l7a-ethynyl-19- norandrost-4-en-3-one oxime 1.00 N-(2-tetrahydropyranyloxy) -17fi-acetOXY-l7aethynyl-19-norandrost-4-en-3-one oxime 0.5 17 9-caproyloxy-l7a-ethynyl-19-norandrost-4-en-3- one oxime 0.25 17,8-Propionyloxy-l7a-ethynyl-l9-norandrost-4-en-3- one oxime 0.25 17a-ethynyl-19-nortestosterone 20.0 17a-ethynyl-17fl-acetoxy-l9-nortestosterone 5.0

It will be observed from Table I above that 170:- ethynyl 17p acetoxy-19-norandrost-4-en-3-one oxime eliminates the production of litters in rats at a dose of 0.25 mg. per kilogram of body weight per day, while a daily dosage of 5.0 mg./kilogram of body weight of its precursor l7a-ethynyl-17(3-acetoxy-l9-nortestosterone is required to accomplish the total suppression of litters. It will also be observed that 0.25 mg. per kilogram of body weight per day of 17a-ethynyl-19-norandrost-4-en-l7,8-ol- 3-one oxime totally suppresses rat litters while 20.0 mg. per kilogram of body weight per day of its precursor 17aethynyl-l9-nortestosterone is required to accomplish total suppresssion of rat litters.

In order to determine the post-coital effect of a compound, female rats of the Wistar strain are fed a compound by gavage on specific days of gestation after sperm are observed in the vagina. The rats are sacrificed and the uterii are examined for implantation and resorbtion sites.

In the following table, day is the day on which sperm is observed in vaginal washings and the compound tested was l7a-ethynyl-1719-acetoxy-19-norandrost-4-en 3 one oxlme.

TAB LE II Day of Implantatlons Dose adrninls- Pregnant! (1ng./kg.) tration total Normal Besorbed It will be observed from Table II that in the species treated, the compound was most eflicacious at dose levels of 10 mg./kg. and S rug/kg. on days 1 and 2 of pregnancy.

It is believed that the compounds of the invention act post-coitally by lysing the zygote and that this action is most etfective from between 36 to hours after fertilization of the ovum.

What is claimed is:

1. A method of suppressing reproduction comprising administering to female animals an effective anti-littering amount of a compound of the formula:

RON

wherein R is selected from the group consisting of hydrogen and acyl of from 2 to 8 carbon atoms, R is selected from the group consisting of hydrogen and acyl of from 2 to 10 carbon atoms, and R" is selected from the group consisting of methyl and ethyl, whereby littering is prevented.

2. The method of claim 1 in which said compound is 17a-ethynyl-l9-norandrost-4-en-17 6-ol-3-one oxime.

3. The method of claim 1 wherein said compound is 17a-ethynyl-17fl-acetoxy-l9-norandrost-4-en-3-one oxime.

4. The method of claim 1 in which said compound is administered orally.

5. The method of claim 2 in which said compound is administered orally.

6. The method of claim 3 in which said compound is administered orally.

7. The method of claim 4 in which said compound is administered to humans.

8. The method of claim 5 in which said compound is administered to humans.

9. The method of claim 6 in which said compound is administered to humans.

10. The method of claim 7 in which said compound is administered in a continuous series of daily doses.

11. The method of claim 8 in which said compound is administered in a continuous series of daily doses.

12. The method of claim 9 in which said compound is administered in a continuous series of daily doses.

No references cited.

RICHARD L. HUFF, Primary Examiner 

